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參數(shù)資料
| 型號(hào)： | ADS7844NB |
| 元件分類(lèi)： | 通用總線(xiàn)功能 |
| 英文描述： | CMOS 8-Stage Presettable 8-Bit Binary Synchronous Down Counter 16-TSSOP -55 to 125 |
| 中文描述： | 12位，8通道串行輸出采樣模擬到數(shù)字轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 12/14頁(yè) |
| 文件大?。?/td> | 204K |
| 代理商： | ADS7844NB |
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ADS7844
Digital Timing
Figure 5 and Tables VI and VII provide detailed timing for
the digital interface of the ADS7844.
15-Clocks per Conversion
Figure 6 provides the fastest way to clock the ADS7844.
This method will not work with the serial interface of most
microcontrollers and digital signal processors as they are
generally not capable of providing 15 clock cycles per serial
transfer. However, this method could be used with field
programmable gate arrays (FPGAs) or application specific
integrated circuits (ASICs). Note that this effectively in-
creases the maximum conversion rate of the converter be-
yond the values given in the specification tables, which
assume 16 clock cycles per conversion.
PD1
0
PD0
0
Description
Power-down between conversions. When each
conversion is finished, the converter enters a low
power mode. At the start of the next conversion,
the device instantly powers up to full power. There
is no need for additional delays to assure full
operation and the very first conversion is valid.
0
1
Reserved for future use.
1
0
Reserved for future use.
1
1
No power-down between conversions, device al-
ways powered.
TABLE V. Power-Down Selection.
SYMBOL
DESCRIPTION
MIN
TYP
MAX
UNITS
t
ACQ
t
DS
t
DH
t
DO
t
DV
t
TR
t
CSS
t
CSH
t
CH
t
CL
t
BD
t
BDV
t
BTR
Acquisition Time
DIN Valid Prior to DCLK Rising
DIN Hold After DCLK HIGH
DCLK Falling to DOUT Valid
CS Falling to DOUT Enabled
CS Rising to DOUT Disabled
CS Falling to First DCLK Rising
CS Rising to DCLK Ignored
DCLK HIGH
DCLK LOW
DCLK Falling to BUSY Rising
CS Falling to BUSY Enabled
CS Rising to BUSY Disabled
1.5
100
10
μ
s
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
200
200
200
100
0
200
200
200
200
200
TABLE VI. Timing Specifications (+V
CC
= +2.7V to 3.6V,
T
A
= –40
°
C to +85
°
C, C
LOAD
= 50pF).
SYMBOL
DESCRIPTION
MIN
TYP
MAX
UNITS
t
ACQ
t
DS
t
DH
t
DO
t
DV
t
TR
t
CSS
t
CSH
t
CH
t
CL
t
BD
t
BDV
t
BTR
Acquisition Time
DIN Valid Prior to DCLK Rising
DIN Hold After DCLK HIGH
DCLK Falling to DOUT Valid
CS Falling to DOUT Enabled
CS Rising to DOUT Disabled
CS Falling to First DCLK Rising
CS Rising to DCLK Ignored
DCLK HIGH
DCLK LOW
DCLK Falling to BUSY Rising
CS Falling to BUSY Enabled
CS Rising to BUSY Disabled
900
50
10
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
100
70
70
50
0
150
150
100
70
70
TABLE VII. Timing Specifications (+V
CC
= +4.75V to
+5.25V, T
A
= –40
°
C to +85
°
C, C
LOAD
= 50pF).
FIGURE 6. Maximum Conversion Rate, 15-Clocks per Conversion.
FIGURE 5. Detailed Timing Diagram.
PD0
t
BDV
t
DH
t
CH
t
CL
t
DS
t
CSS
t
DV
t
BD
t
BD
t
TR
t
BTR
t
D0
t
CSH
DCLK
CS
11
DOUT
BUSY
DIN
10
1
DCLK
CS
11
DOUT
BUSY
A2
S
DIN
A1 A0
DIF
PD1 PD0
10
9
8
7
6
5
4
3
2
1
0
11
10
9
8
7
6
5
4
3
2
A1 A0
15
1
15
1
A2
S
A1 A0
DIF
PD1 PD0
A2
S
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADS7845 | CMOS 8-Stage Presettable 8-Bit Binary Synchronous Down Counter 16-TSSOP -55 to 125 |
| ADS7845E | TOUCH SCREEN CONTROLLER |
| ADS7846IGQCR | TOUCH-SCREEN CONTROLLER |
| ADS7846IRGVR | TOUCH-SCREEN CONTROLLER |
| ADS7846IRGVT | TOUCH-SCREEN CONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS7844NB | 制造商:Texas Instruments 功能描述:A/D CONVERTER (A-D) IC ((NW)) 制造商:Texas Instruments 功能描述:IC, ADC, 12BIT, 200KSPS, SSOP-20 |
| ADS7844NB/1K | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8-Ch Serial Output Sampling RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類(lèi)型:Differential 信噪比:107 dB 接口類(lèi)型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7844NB/1KG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8-Ch Serial Output Sampling RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類(lèi)型:Differential 信噪比:107 dB 接口類(lèi)型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7844NBG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8-Ch Serial Output Sampling RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類(lèi)型:Differential 信噪比:107 dB 接口類(lèi)型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS7844NG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 8-Ch Serial Output Sampling RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類(lèi)型:Differential 信噪比:107 dB 接口類(lèi)型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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